EP0492013A1 - Ustensile de coupe - Google Patents

Ustensile de coupe Download PDF

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Publication number
EP0492013A1
EP0492013A1 EP90314354A EP90314354A EP0492013A1 EP 0492013 A1 EP0492013 A1 EP 0492013A1 EP 90314354 A EP90314354 A EP 90314354A EP 90314354 A EP90314354 A EP 90314354A EP 0492013 A1 EP0492013 A1 EP 0492013A1
Authority
EP
European Patent Office
Prior art keywords
blade
shank
shanks
posts
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90314354A
Other languages
German (de)
English (en)
Inventor
Anthony Rose
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP90314354A priority Critical patent/EP0492013A1/fr
Publication of EP0492013A1 publication Critical patent/EP0492013A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B13/00—Hand shears; Scissors
    • B26B13/04—Hand shears; Scissors with detachable blades

Definitions

  • the present invention relates to the field of scissors, shears and similar cutting implements and more particularly to a novel such cutting implement having removable or replaceable shank inserts or cutting blades therefor.
  • the present invention provides a novel cutting implement having an elongated shank or holder provided with a shaped recess for insertably receiving a replaceable blade.
  • the recess is provided with contoured surfaces defining the respective ends of the opening or recess so that insertion and ejection of the blade is self-locating and self-ejecting when urged into or out of the recess or opening.
  • Guide means are respectively and cooperatively carried on the replaceable blade and the implement within the opening for positive retention when the replaceable blade has been properly located within the opening.
  • Such positive retention is yieldable for release by forcible engagement with an end shoulder exposed for the purpose of engagement by a removal tool or means.
  • the shaped surfaces for guidance and alignment of the replaceable blade within the shank of the implement are placed at aligned angles with respect to one another so as to permit relatively convenient and inexpensive formation utilizing surgical steel as the composition for the implement.
  • Another object of the present invention is to provide a novel cutting device incorporating a replaceable cutting blade in the form of an insert adapted to be guided into and out of a receiving opening on the implement and which is relatively economical to manufacture and to use.
  • Another object of the present invention is to provide a novel cutting implement having replaceable cutting blades which are sufficiently inexpensive to permit disposal thereof then dull or damaged once they have lost their cutting edge or have become contaminated.
  • Still a further object of the present invention is to provide a novel cutting implement, having replaceable blades, which includes self-indexing or registering means for automatically located a replaceable blade on the instrument and which further includes a positive, snap-lock retention means for yieldably holding the replaceable blade in the location.
  • a further object of the present invention is to provide a novel cutting device, utilizing replaceable blades, which incorporates a positive retention means on a shank for releasably holding the replaceable blade in position, and which further includes centering or guidance means for locating a respective replaceable cutting blade on the shank so that it is in position to perform its intended purpose.
  • FIGURE 1 the novel cutting implement or device of the present invention is illustrated in the general direction of arrow 10 which takes the form, in one version, of a scissors being formed with a first shank 12 and a second shank 14.
  • the rear ends of the shanks 12 and 14 are formed into openings 16 and 18 respectively, to facilitate cooperation with the fingers of a person using the implement.
  • the forward end of each of the shanks 12 and 14 is formed into blades 20 and 22 respectively. Blades 20 and 22 are to be movable together in an abutting relationship by means of movement of the shanks 12 and 14 about a pivot connection 24.
  • the respective blades 20 and 22 include cutting edges 26 and 28 which engage with each other along a shear line defined by the opposing and abutting surfaces of the forward end of shanks 12 and 14 respectively.
  • the shear line is indicated by the numeral 30.
  • each forward end of a shank includes an elongated opening defined by sloping surfaces at the opposite ends of the opening, which are defined by portions 34 and 38 respectively.
  • the square or diamond shape of the cross posts 44 and 46 includes external surfaces which run in parallel with respect to the surface 36 and the surfaces 40 and 42 respectively. These surfaces form guide means for directing the replaceable cutting blade while being inserted into the opening 32. Guide means are included which cooperate with conformal surfaces provided on the replaceable cutting blade 20 in order to effect correct insertion of the blade into the opening and, ultimately, to provide positive retention.
  • the blade includes a cutting edge 26 along one side while the opposite side is provided with a pair of recesses leading into elongated slots 48 and 50 respectively.
  • the cross posts 44 and 46 are aligned with the recesses and as the blade is slipped through the opening 32, the blade is forced rearwardly by the engagement of slope 36 with a forward inclined surface 52 on the blade and engagement of the external surfaces of the cross posts 44 and 46 with surfaces 54 and 56 of the first recess leading into slot 48, and by means of opposing, sloping surfaces 58 and 60, defining the other recess associated with slot 50 and the external surfaces of the cross post 46.
  • the rearmost terminating end of the replaceable blade 20 includes a dovetail pair of surfaces 62 and 64 which mate with surfaces 40 and 42 to provide positive alignment and registry for locating the blade within the opening 32.
  • the surfaces 62 and 64 terminate in a converging fashion with an opening 66 so that the tail of the blade may be slightly expanded or biased to be in firm engagement with the dovetail portion 38 of the shank.
  • the blade 20 has been indexed, registered and located within the opening 32 by means of the slopes, angled surfaces cooperating with conformal slopes and angular surfaces on the blade.
  • the blade 20 is nested within the opening between the opposite sidewalls of the forward end of shank 12 so that a tip of the blade 70 rests against the nose portion 34 while the conformal surfaces 36 and 52 are in abuttment.
  • the dovetail surfaces 40 and 42 are in alignment with the surfaces 62 and 64 so that the ends of the blade are biased outwardly.
  • the forward and rear ends of the blade are prevented from being inadvertently removed from the opening 32.
  • FIGURES 4 and 5 means are shown for automatic ejection of the replacement cutting blade 20, which comprises an exposed shoulder, identified by numeral 78, on the extreme rear end of the blade 20.
  • the exposed shoulder 78 is terminated within a notch 80 provided in the forward end of the shank 12 immediately ahead and adjacent to the pivotal connection 24. Therefore, an open notch is provided immediately behind the shoulder 78 into which a removal implement may be placed to urge the blade 20 forwardly.
  • a removal implement is the opposite shank of the scissors.
  • both shanks and cutting blades are identical and when shank 14 is cocked so that the shoulders 78 of each blade are within the respective slots of each shank, engagement between the shoulders occurs.
  • the scissors may be closed and the shanks converged, causing the shoulders to forcibly engage to eject the respective blades.
  • the pivotal connection 24, or fastener, which is employed usually has a relatively small diameter head surface.
  • the shanks usually has a relatively small diameter head surface.
  • Sufficient play is available to permit the shanks to be canted or cocked with respect to one another so that shoulder 78 engagement between the blades can occur. In the position shown in FIGURE 5, such engagement is illustrated preparatory to closing of the scissors to effect ejection.
  • FIGURE 6 another means is illustrated for blade ejection which includes a circular aperture 82 provided through the dovetail portion 38 into which a tip 84 of a rod 86 is thrust.
  • the tip 84 is tapered or conical so that as the rod is further pushed through the aperture 82, the external surface of the conical tip 84 will engage with surfaces 62 and 64 of the rear end of blade 20.
  • additional force urges the blade over the retention bead 72 so that the blade assumes the position shown in FIGURE 3 and may be removed from the opening 32.
  • the cutting device of the present invention involves an implement having an opening for insertably receiving a replaceable cutting blade that may be readily introduced into a cavity or opening on the shank of the implement and forced into a retained position.
  • the implement includes, in accordance with the invention, guide means for automatically directing the cutting blade into proper aligned position on the shank and includes indexing and registering means for locating the blade in the proper position.
  • guide means for automatically directing the cutting blade into proper aligned position on the shank and includes indexing and registering means for locating the blade in the proper position.
  • Such means is comprised of conformal surfaces cooperatively disposed or the cutting blade and the implement that work together for proper placement. Positive retention of the blade within the implement is assured by the snap-lock arrangement comprising the spring finger 74 with the bead 72 at its opposite end for releasable engagement with the post 46.
  • Conformal surfaces on the implement not only include those on the nose portion 34 and the tail portion 38, but the surfaces on the posts 44 and 46.
  • the mating or conformal surfaces on the blade include the forward sloping surface 52 and the dovetailed surfaces 62 and 64 on the tail end of the blade.
  • Surfaces 54 and 56, as well as surface 60, cooperate with the surfaces on posts 44 and 46 to achieve registration and alignment.
  • the device is relatively inexpensive to manufacture as compared to other devices of high temper quality since the opening 32 conveniently may be prepared from bar stock by first passing a cutting tool from the top of the forward end of the shank through to create a slot between surface 36 and post 34. Next, a second pass is effected to provide a slot between posts 44 and 46, followed by a third pass to provide the slot between posts 46 and surface 42. Next, the cutter or broach is positioned so that a cut or slot is made between post 44 and the tip of the angled surface 36, followed by another pass of the cutter or broach to provide a slot at a different angle between posts 44 and 46. A. final cut is then made between the surface 40 and the post 46 so that the opening 32 is now defined as illustrated. In this fashion, the posts and angled portions 34 and 38 are provided without requiring difficult cuts or dimensional provisions. Fabrication technique is relatively simple and uncomplicated so that mass production can be inexpensively achieved.
  • a blade 90 may be inserted into a slotted area 91 on the end of shark 92.
  • the blade is captured in the slot by means of the interconnection of the spring-loaded arm 93 with the cross stud or piece 94.
  • the front end of the blade represented by sloping surface 95, and the sloping notched or open portion 96 cooperate with the sloping surface 97 of the shank as well as the cross stud 98 to guide and properly locate the blade within the slot 91.
  • the wedge-shaped end of the blade represented by numeral 99, conforms to the wedge shape 100 formed in the shank to terminate the end of slot 91 opposite from the end terminated by sloping surface 97.
  • the blade 90 protrudes through the lower end of the shank 92.
  • FIGURES 9 and 10 another embodiment of the invention is shown wherein the sloping surface 97 and the sloping surface 101 of the shank guide the blade 102 into position so that the cross piece 103 through the slot 104 engages with the notched opening 105 of the blade 102.
  • the front cross piece 106 of the shank cooperates with the shape of notch 107 to accept the forward end of the blade while the lateral extension of the notch, indicated by numeral 108, serves to resiliently lock the blade in position.
  • FIGURE 11 shows still a further version wherein the blade, represented by numeral 112, is substantially curved along its bottom, as represented by numeral 109, and includes both a guide and locking notch 110 adapted to be received over the cross piece 113 within the slot 114 of the shank 115.
  • the opposite ends of the slot are curved at surfaces 116 and 117 to conform with the curved bottom portion of the blade 112.
  • the extreme bottom portion may be flat; however, it is to be understood that the ends of the bottom are curved to conform with the shank curved surfaces 116 and 117.
  • the shank is provided with a slot that terminates at its lower end so as to complete house the blade 112. Therefore, the slot 114 does not proceed all the way through the bottom and terminates in the flat area, represented by numeral 120.
  • the scissors of the present invention are provided with disposable or replaceable inserts which have a main body which may be separately sterilized from the inserts which have been sterilized prior to use by gamma radiation or ethylene oxide gas light.
  • the inserts may be easily inserted into the shanks of the scissors where the blades are positively engaged with the solid cross posts or elements by means of the spring-action arm carried on each of the blades.
  • Each blade is guided by the configuration of the blade conforming with the configuration of the slot in the scissor shank as the aft end of the blade is lowered into it. Full insertion of the blade into the slot of the scissors shank locks the blade into its desired position.
  • the inserts are loaded similarly to injector razors or the like and once seated, can only be removed by applying opposite pressure, such as by twisting one scissor shank with respect to the other so that the shoulders 78 engage and force the blades out of the respective slots.
  • the slow, applied twisting motion will exert the force that is necessary to open the blade spring-lock for ejection.
  • Blade exchange can be accomplished in a few seconds, thereby eliminating troublesome sharpening procedures and continuous paperwork.
  • the cost of the blades is considerably less than the cost or resharpening and the convenience factor is obvious.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Scissors And Nippers (AREA)
EP90314354A 1990-12-27 1990-12-27 Ustensile de coupe Withdrawn EP0492013A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP90314354A EP0492013A1 (fr) 1990-12-27 1990-12-27 Ustensile de coupe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90314354A EP0492013A1 (fr) 1990-12-27 1990-12-27 Ustensile de coupe

Publications (1)

Publication Number Publication Date
EP0492013A1 true EP0492013A1 (fr) 1992-07-01

Family

ID=8205668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90314354A Withdrawn EP0492013A1 (fr) 1990-12-27 1990-12-27 Ustensile de coupe

Country Status (1)

Country Link
EP (1) EP0492013A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774935A1 (fr) 1998-02-19 1999-08-20 Manuf D Articles De Precision Ciseaux a lames interchangeables

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890388A (en) * 1988-10-05 1990-01-02 Rose Anthony T Cutting implement with detachable blades

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890388A (en) * 1988-10-05 1990-01-02 Rose Anthony T Cutting implement with detachable blades

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2774935A1 (fr) 1998-02-19 1999-08-20 Manuf D Articles De Precision Ciseaux a lames interchangeables

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